Valve and valve-gear for engines.



N0. 686,!75. Patented Nov. 5, Mil. F. J. WILKE.

VALVE AND VALVE GEAR FOR ENGINES.

(Appliation filed Apr. 1, 1901. (No Model.) N 5 Shuts-Sheet 'l.

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N0. 686,!75. Patented Nov. 5, [90L F. J. WILKE.

VALVE AN'D VALVE GEAR FOR ENGINES. qkpplicaw'pn filed 4w. 1, 1901. inModel.) 1 5Shaets-Sheet 2.

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N0. 686,l75. Patented Nov. 5, I90l'. Y

F. J. WILKE. VA LVE AND VALVE GEAR FDR ENGINES.

(Applicatidn filed Apr. 1. 1901.

(No Model.) 7

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No. 686,l75. Patented Nov. 5, l90l.

F. J. WILKE.

VALVE AND VALVE GEAR FOR ENGINES.

(Application mall 31m .1, 1901.)

(No Model.) 5 Sheets-Sheet 4.

WITNESSES.- m VENTOH No. 686,l75. Patented Nov. 5, 19m} F. .1. WILKE.

VALVE AND VALVE GEAR FOB ENGINES.

' (Application filed Apr. 1, 190 (No Model.) 5 Sheets-Sheet 5.

I QZIILIif:fiifjji g IN VENTOH fl Nnnn STATES PATENT OFFICE.

FRANK J. VVILKE, OF LITTLE ROCK, ARKANSAS.

VALVE AND VALVE-GEAR FOR ENGINES.

SPECIFICATION forming part of Letters'latent No. 686,175, dated November5, 1901. Application filed April 1, 1901. Serial No. 53,837. (No model.)

To all whom it may concern.-

Be it known that I, FRANK J .WILKE, a citizen of the United States, anda resident of Little Rock, in the county of Pulaski and State ofArkansas, have invented a new and Improved Valve and Valve-Gear, ofwhich the iollowing is a full, clear, and exact descripion.

This invention relates to the form and operating-gear of the valves forreciprocating steam-engines. I employ a rocking valve, with which arelease or fiy-back valve works, to cover and uncover the exhaust. Thevalve is driven from a rocker provided with an adj ustable partcontrolled by the governor and to. which the valve-rod is connected, soas properly to control the steam.

This specification is a specific description of one form of myinvention, while the claims are definitions of the actual scope thereof.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the views.

Figure 1 is a side View of the invention. Fig. 2 is a plan view thereof,partly in section, on the line 2 2 in Fig. 1. Fig. 3 is a section of thecylinder and valve-chest on the line 3 3 of Fig. 5. Fig. 4 is anelevation of the trip devices for the fly-back valves. Fig. 5 is asection on the line 5 5 of Fig. 3. Fig. 6 is an end view of one of thefly-back valves, and Fig. 7 is a diagrammatic section illustrating theaction of the engine.

aindicates the cylinder; a, the valve-chest; 0. the steam-pipe, and athe engine-frame.

a indicates the steam-ports, and a and a, respectively, the steam andexhaust chambers of the valve-chest.

a indicates the valve-seats, which are disposed transversely of thecylinder and pass entirely through the chest at these seats terminatingin enlargements a and being covered by caps a", forming parts of theexterior walls of the valve-chest. The valveseats communicate bysuitable passages (see Fig. 3) with the steam-chamber a theexhaust-chamber a, and the steam-ports a.

1) indicates the main valves, which are cylindrical in form and fittedto oscillate in the valve-seats a". Each valve has a feed-port h,serving at proper periods of the operation to connect the chamber a andthe steamports a, and an exhaust-port 17*, serving in the same manner toconnect the chamber a with'the steam-ports a 0 indicates the fly-backvalves, which lie in parallelism with the main valves and occupycavities b in the end walls of said valves, the fiy-back valvesextending through the exhaust-ports b of the valves b and the cavities19 therein being sufficient in size to allow the valves 0 thatindependent movement essential to the operations to be hereinafterexplained. The valves have inwardly-extending arms a at their ends,mounted loosely on the stems b of the valves 1) and lying, respectively,at the ends of said valves 1) within the cavities a at the ends of thevalve-seats a (See Fig. 5.) The main valves are keyed on the stems. (SeeFig. 3.)

On one end of each valve 12 and lying within one cavity a of eachvalve-seat is pivoted a latch 0 spring-pressed, so as normally to engagewith-a notched plate 0 carried on the adjacent arm 0' of the coactingvalve 0. These latches are disengaged from the plates 0 as the valvesturn by trips 0 arranged in the paths of the latches, and heldstationary with the walls of the valve-chest and located within the samevalve-seat enlargements a as contain the latches 0 When the latches 0release the valves 0, they are thrown to open position (see V, Fig. 7)by spring-arms 0 connected with the arms a of the valves 0 by links 0and arranged at the same end of the valve as the parts 0 and c Each endof the valves 0 is provided with a ring 0', and these rings lie on theouter ends of the valves 1; to cover the before-mentioned cavities b ofsaid valves. The latches a being normally engaged with the valves 0,such valves rock with the main valves until the latches are disengaged,which occurs when they strike the trips 0 (See left-hand end of Fig. 4.)When this takes place, the spring-arms c assert themselves and thevalves 0 are thrown independently of the main valves to uncover theexhaust.

The valves are driven by the connectingrod (1 from the eccentric. (Notshown.) This rod d is connected with a rocker (1, carried fast on ashaft d supported in a pedestal 0. from the engine-frame. Carriedpivotally on the rocker d are two arms (1 located at opposite sides ofthe axis of the rocker and having rods d respectively pivoted thereto.The rods d are crossed (see Fig. 1) and are connected, respectively,with cranks d and d on the stem b of the adjacent valve. Of the cranks dand d the former is fast to the valve-stem to impart a rocking movementthereto, and the latter is a loose crank, to which is connected a rod dextending to the other valve and connected therewith through the mediumof a crank 01 on the stem of said other valve. The movements of thevalves are regulated in accordance with the proper speed of the engineby a slide (1 mounted on a guide al carried fast on the shaft d androcking in time with the rocker d. This slide d is connected by links 61to the arms d and by movement of the slide the throw of the arms 61 maybe controlled, thus regulating the movement of the parts d d d CF, and dand consequently of the valves. The slide (1 is moved by a rod 01actuated from the governor c1 and having engagement with the walls of aslot formed in the slide and curved around the center of movementthereof. The rod 61 is held to slide, but prevented from other movementby an arm at on the pedestal a Having described above the preferredconstruction and arrangement of the parts of my invention, I will nowproceed to trace the action of the valves.

The valves are rocked by the gear provided therefor and the action ofthe governor on the slide d controls the admission of steam. Referringto Fig. 3, it will be seen that the left-hand valve'is turning in thedirection of the arrow e to close the exhaust. During this movement therelease or fly-back valve 0 is stationary, the latch 0 having beendisengaged therefrom. (See right-hand side of Fig. 4.) As the valve bmoves (left hand, Fig. 3, and right hand, Fig. 4) it closes the adjacentport a and at the same time the latch 0 enters the notched plate a andthen the valve 0 moves on with the valve 1). As the valves rock back thelatch c engages the trip 0 and the spring-arm o throws the valve 0independently of the valve b, thus uncovering the exhaust. Fig. 3 (righthand) and Fig. 4 (left hand) show the parts during or immediately beforethe operation. The movements are indicated by the several arrows e inthe views referred to. Fig. 7 shows diagrammatically the positions ofthe valve in reference to the piston positions. Positions I and I showthe exhaust closed or the point of compression,

the piston nearing the end of its stroke; positions II and II show thevalve the instant before the steam is admitted and the piston at the endof its stroke; positions III and III show the valve open to admit thesteam and the piston started on its return stroke; positions 1V and IVshow the cut-01f, and positionsV and V show the exhaust. The movementsare indicated by the arrows e. The

valve 0 moves with the valve b until it reaches a point somewhat beyondposition 1V, thus covering the exhaust and prolonging the period ofcompression. Then the latch c is released and the valve 0 flies backaway from the steam-port a and the steam is exhausted.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The combination of a main valve, with exhaust andfeed passages therein, and a release or fiy-back valve arranged at theexhaust-passage of the main valve and movable independently to cover anduncover the exhaust.

2. The combination of a main valve with exhaust and feed passagestherein, a release or fly-back valve arranged at the exhaust-passage forthe purpose specified, and movable independently of the main valve, areleasable device for holding the two valves to move together, and ameans for independently moving the release-valve upon the disengagementof said device for holding the valves together.

3. The combination of an oscillating main valve, a release or fly-backvalve capable of independent movement thereon, a latch carried by themain valve and engaging the release-valve, a trip mounted in the path ofthe latch to release the same, and a spring pressing the release-valve.

4. The combination of a rocker, a governorcontrolled slide arranged torock therewith, an arm mounted on the rocker and movable independentthereof, and a connection between said arm and the slide.

5. The combination of a rocker, a governorcontrolled slide arranged torock therewith, an arm pivoted on the rocker, and a link extendingbetween the free part of the arm and the slide.

6. The combination of a valve, a rod connected therewith, a rocker, anarm mounted thereon and connected with the rod, said arm being movableindependently of the rocker, a governor-controlled slide moving with therocker, and a connection between the said arm and the slide.

7. The combination ofa valve, comprising a main part and a fiy-back partLindependently movable on the main part, a releasable device for holdingthe two parts to move together, a trip for said releasable part, avalverod, a rocker, a governor controlled slide moving with the rocker,an arm mounted on the rocker and connected with the valve-rod, said armbeing movable independently of the rocker, and a connection between theslide and arm.

8. The combination with an engine-cylin der, of a main valve commandingthe feed and exhaust, and a relief or fly-back valve workingin time withthe main valve and serving temporarily to cover the exhaust.

9. The combination with an enginecylinder, of a valve commanding thefeed and exhaust, a relief or fiy-back valve working in dependentlythereof, a connection between the arm and the valve, and aconnectionbetween the arm and the slide.

In testimony whereof I have signed my I 5 name to this specification inthe presence of two subscribing witnesses.

FRANK J. *vVILKE.

HOWARD ADAMS,

Witnesses: l B. D. PLUNKETT.

